Not if you want the pistol to function correctly. Not only will you need to bite the price bullet but then you hope for a good used mag. Tripple K makes one and others offer them under other names but all i have seen were Tripple K production and therein lies the problem. There are aftermarket magazine producers that make quality stuff ( not for Llama's though) but my experience with Tripple K has included: fine ---work as expected, not so fine ---and had dimension problems or poor manufacturing causing early failure.
Purchasing used magazines, if truly represented, can get good reliable items at often sky high prices. I would rather buy one from a GB seller that worked rather than a less money Tripple K that would make me upset in the long run.
By the way I have two fifties vintage Llama's that work just fine with genuine Llama mags.